Crackfox

I have been wanting to get a nice 2nd car for a while now and really want to get a skyline, Im preferably after a manual r32 gtst or gts. What I would like to know is how much I will need to buy a fairly cheap stockish example in average/reasonable condition? Right now I can pay up to 6k for one, not including 1.5k set aside for maintanance and repairs. Is this reasonable? I'll probably do around 5-10k kms on it a year so what can I expect maintenance costs to be?